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Technical Briefs

A New Compliant Mechanical Amplifier Based on a Symmetric Five-Bar Topology

[+] Author and Article Information
P. R. Ouyang

Department of Aerospace Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canadapouyang@ryerson.ca

W. J. Zhang

Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, S7N 5A9, Canadachris.zhang@usask.ca

M. M. Gupta

Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, S7N 5A9, Canadamadan.gupta@usask.ca

J. Mech. Des 130(10), 104501 (Aug 21, 2008) (5 pages) doi:10.1115/1.2965600 History: Received April 25, 2007; Revised April 21, 2008; Published August 21, 2008

A mechanical amplifier is an important device, which together with a piezoelectric actuator can achieve motion with high resolution and long range. In this paper, a new topology based on a symmetric five-bar structure for displacement amplification is proposed, and a compliant mechanism is implemented for the amplifier. In short, the new mechanical amplifier is called a compliant mechanical amplifier (CMA). The proposed CMA can achieve large amplification ratio and high natural frequency, as opposed to the existing CMAs, in terms of topology. Detailed analysis with finite element method has further shown that a double symmetric beam five-bar structure using corner-filleted hinges can provide good performances compared with its counterpart, which is based on four-bar topology. Finally, experiments are conducted to give some validation of the theoretical analysis.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Buckling beam topology for displacement amplification

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Figure 2

Lever arm and doubled arm topologies for displacement amplification

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Figure 3

Parallel four-bar topology for displacement amplification

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Figure 4

Double symmetric four-bar topologies for displacement amplification

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Figure 5

Symmetric five-bar topologies for displacement amplification

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Figure 6

Schematic of new CMA and its PRBM based on symmetric five-bar topology

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Figure 7

CMA based on double symmetric four-bar topology

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Figure 8

Different profiles of the designed CMAs

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Figure 9

Dimension and flexure hinge parameters of the designed CMA

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Figure 10

Prototype of the CMA

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Figure 11

Static experimental results of the designed CMA

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